Improvement in bolt-trimmers



A. GRAHAM. Bolt-Trimmer.

Patented July 13,1875.

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ALEXANDER GRAHAM, OF MUMFORD, NEW YORK.

IMPROVEMENT IN BOLT-TRIMMERS.

Specification forming part of Letters Patent No. 165,445, dated J uy13,1875; application filed April 21, 1874.

To all whom it may concern Be it known that I, ALEXANDER GRAHAM,

of Mumford, in the county of Monroe and State of New York, have inventedcertain new and useful Improvements in Bolt-Trimmers; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same:

This invention relates to certain improvements in bolt-trimmers of thatclass which are constructed of two levers pivoted together, one of saidlevers being provided at its enlarged end with a cavity for receivingand holding the nut of the bolt, and the other being provided with aconvex cutter-head for trimming off the projecting end of the bolt.

My invention consists in the combination of a lever having a cavity orsocket for holding the nut, a cutting-blade having a cutting-edge, and ayoke or stirrup embracing the cuttingblade, and made adjustable by aset-screw for making the blade out or shear close to its outtin g-face,and regulating its pressure, as hereinafter described.

In the drawings, Figure l is an elevation. Fig. 2 is a similar view,looking on the opposite side. Fig. 3 is an end view, showing a nut inthe socket, and the bolt in the act of being trimmed or cut. Fig. 4 is asection in line w w of Fig. 1. r

A represents the main lever orjaw, having an enlarged head, A, at thetop, in which is cut a square socket or notch, a, of suflicient size toreceive an ordinary nut, as shown by dotted lines in Fig. 2, and blacklines in Fig. 3. B is the supplementary lever or jaw, which is pivotedat bto the main lever, and has a short arm, B, extending beyond. 0 is aconnecting-rod, pivoted at opposite ends to the arm B and end D of thecutter or blade D. The blade is made of curved or hooked form, withasharp edge, 0, and is so arranged as to move across or over the socketto and against the plane-face of the head A. E is a yoke or stirrup inthe form of a loop, which incloses the blade, and is made of such lengthas to allow the blade the proper sweep in opening or closing. For thispurpose the head A is made enlarged/as shown, so as to presentconsiderable breadth, andthe yoke has double bearings d d, which passthrough holes formed in the head. The bearing 01 is simply arivet orstud, but the bearing d is a headed screw which forms the pivot of theblade, passing loosely through the yoke and the blade and screwing intothe head A, thereby enabling the yoke to be clamped up against the bladeto keep it in place, and in close contact with the face over which itcuts.

The operation is as follows: The socket a is inserted over and made toembrace the nut of the bolt, as shown in Figs.2 and 3, thereby bringingthe edge of the blade against the bolt, close up to the nut. The leversA B are then closed together, which causes the blade to cut across theblank a, and thereby trim off the bolt. The yoke E serves the importantpurpose of a guide and stay to keep the cutter in place under its heavystrain. The double bearings d dallow it to be made of desired length andof portable form, so that it may be inserted, tightened up, or removedat pleasure, and thus form a clamp to the blade, which is adjustable inits pressure, and is made to shear close to its cutting-face.

1 am aware that the recess formed in the main bar for holding the nut,and the arrangement of the operating levers, are not new; but

VVh-at 1 claim as new, and desire to secure by Letters Patent, is-- Thecombination of the lever A, provided with the recess afor holding" thenut, with the cutting-blade D and adjustable yoke E, constructed andarranged to operate as set forth.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

ALEX. GRAHAM.

Witnesses WM. PooLE, WM. 'FOOTE.

